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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a9ae0317c23bf8568c7a2c4985fb1bb5f2421fb75f4becf45d0a4a655fc6ae' 
  AND token = 'bo8LagVMm71OUdACkPSF1yujHO1cWimnTUZfgAAkJZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}